(−)-Lytophilippine A: Synthesis of a C1−C18 Building Block
作者:Annika Gille、Martin Hiersemann
DOI:10.1021/ol1023008
日期:2010.11.19
The convergent enantioselective synthesis of a protected C1-C18 building block for the total synthesis of (-)-lytophilippine A was achieved. A catalytic asymmetric Gosteli-Claisen rearrangement and an Evans aldol reaction served as key C/C-connecting transformations during the assembling of the C1-C7 subunit (10 steps from 4, 29%). The synthesis of the C8-C18 segment was achieved utilizing D-galactose as inexpensive ex-chiral-pool starting material (15 steps, 15%). The merger of the subunits was accomplished by a remarkably efficient sequence consisting of esterification and ring-closing metathesis (five steps, 56%).
Synthetic Studies on Lytophilippine A: Synthesis of the Proposed Structure
作者:Ki Po Jang、Soo Young Choi、Young Keun Chung、Eun Lee
DOI:10.1021/ol2007296
日期:2011.5.6
Synthesis of the proposedstructure of lytophilippine A was accomplished employing SmI2-mediated 5-exo cyclization of an aldehydo β-alkoxyvinyl sulfoxide and ring-closing metathesis reaction.